I have a 100 gallon. I want to get a Python system but don't have the money right now(16 years old, very chronically ill so I can't get a job). I have a hose just for my tank, I stick the small tube from my gravel vac as far as it'll go into my hose, and drain it into my bathtub. Then I attach the hose to the sink, run it into the bath for just a little bit to make sure all the gross water is out, then put the end of the hose into the tank and fill. 
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